<div id="map"></div>
<script>
    var map = new mapboxgl.Map({
        container: 'map',
        style: 'mapbox://styles/mapbox/light-v10',
        center: [-90.96, -0.47],
        zoom: 7.5
    });

    map.on('load', function() {
        // Add an image to use as a custom marker
        map.loadImage(
            'https://docs.mapbox.com/mapbox-gl-js/assets/custom_marker.png',
            function(error, image) {
                if (error) throw error;
                map.addImage('custom-marker', image);
                // Add a GeoJSON source with 3 points.
                map.addSource('points', {
                    'type': 'geojson',
                    'data': {
                        'type': 'FeatureCollection',
                        'features': [
                            {
                                'type': 'Feature',
                                'properties': {},
                                'geometry': {
                                    'type': 'Point',
                                    'coordinates': [
                                        -91.395263671875,
                                        -0.9145729757782163
                                    ]
                                }
                            },
                            {
                                'type': 'Feature',
                                'properties': {},
                                'geometry': {
                                    'type': 'Point',
                                    'coordinates': [
                                        -90.32958984375,
                                        -0.6344474832838974
                                    ]
                                }
                            },
                            {
                                'type': 'Feature',
                                'properties': {},
                                'geometry': {
                                    'type': 'Point',
                                    'coordinates': [
                                        -91.34033203125,
                                        0.01647949196029245
                                    ]
                                }
                            }
                        ]
                    }
                });

                // Add a symbol layer
                map.addLayer({
                    'id': 'symbols',
                    'type': 'symbol',
                    'source': 'points',
                    'layout': {
                        'icon-image': 'custom-marker'
                    }
                });
            }
        );

        // Center the map on the coordinates of any clicked symbol from the 'symbols' layer.
        map.on('click', 'symbols', function(e) {
            map.flyTo({
                center: e.features[0].geometry.coordinates
            });
        });

        // Change the cursor to a pointer when the it enters a feature in the 'symbols' layer.
        map.on('mouseenter', 'symbols', function() {
            map.getCanvas().style.cursor = 'pointer';
        });

        // Change it back to a pointer when it leaves.
        map.on('mouseleave', 'symbols', function() {
            map.getCanvas().style.cursor = '';
        });
    });
</script>
